arm64: mm: HVO: support BBM of vmemmap pgtable safely

Implement vmemmap_update_pmd and vmemmap_update_pte on arm64 to do
BBM(break-before-make) logic when change the page table of vmemmap
address, they will under the init_mm.page_table_lock.  If a translation
fault of vmemmap address concurrently happened after pte/pmd cleared,
vmemmap page fault handler will acquire the init_mm.page_table_lock to
wait for vmemmap update to complete, by then the virtual address is valid
again, so PF can return and access can continue.  In other case, do the
traditional kernel fault.

Implement vmemmap_flush_tlb_all/range on arm64 with nothing to do because
tlb already flushed in every single BBM.

Link: https://lkml.kernel.org/r/20240113094436.2506396-3-sunnanyong@huawei.com


Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>